This is the internet, rebuilt on hardware that never holds still. And somehow, it works.

A tower stays put for decades. Here, the tower is a satellite crossing the sky at 7.5 km/s.

Every hard part of Starlink falls out of one fact: the routers move. Here is the whole map.

Geostationary is simple — three satellites reach everyone. But every packet flies 143,000 km round trip, and light is the limit.

Geostationary needs three satellites and accepts 600 ms. Starlink chose 550 km — and the burden of thousands.

Nothing turns to follow the sky. Change the timing offsets and the beam re-points itself — and can split to several satellites at once.

Scanning would waste precious seconds. The dish points straight where the satellite will be — and pre-bends the frequency for the Doppler shift.

A satellite paints a spot about a thousand kilometres wide. Inside it sits a gateway — and from there it is ordinary fiber.

The link never settles. As each satellite climbs and sets the round trip drifts, and a handover every ~15 seconds snaps it back — so even your best case keeps moving.

Point too low and the horizon eats the signal. Point near the equator and you blind a GEO satellite. Every beam is a solution to all of it at once.

OSPF and BGP exist to discover failure and slowly re-converge. Here the orbits are known, so the next path is computed before the current one expires — convergence time is zero.

The satellites are dumb, fast pipes. The thinking — who routes where, and when — happens on the ground and is uploaded ahead of time.

No lasers, no mesh. A Gen-1 satellite could only bounce your packet straight back down. It had to see you and a gateway at the same time.

Roughly nine thousand laser links now stitch the fleet into a mesh. A packet can cross the sky sat-to-sat, never touching the ground until the very end.

Undersea fiber follows the seabed through glass. The mesh cuts a near-straight line through vacuum. Past about three thousand kilometres, space wins.

Light in fiber crawls at about two-thirds of c. In vacuum it runs flat out. The two lines cross near three thousand kilometres — and after that, space is simply faster.

The satellites churn beneath you constantly. But your address lives at a fixed point of presence — Seattle, Frankfurt, London. The endpoints never move, so the connection holds.

Different bands up and down, and a round trip that never settles. Congestion control like BBR is what keeps a stream smooth while the link quietly rebuilds itself.

Three hardware generations fly together — bent pipe, laser mesh, direct-to-cell. Each satellite lasts about five years, then burns itself up on a controlled way down.

From a boat in the Atlantic: up to a satellite, three laser hops across the sky, down through an Irish gateway, and into a London data centre. Tens of thousands of kilometres, in about sixty milliseconds.

Every fifteen seconds one satellite drops below the horizon and another takes the beam. The route is torn down and rebuilt in under a second. Your TLS session never even blinks.

Starlink is not magic — it is these six decisions, applied ruthlessly.